M 4.8 earthquake: Philippine Sea (Agana, Guam) — December 18, 1987

M 4.8 earthquake: Philippine Sea (Agana, Guam) — December 18, 1987. Epicenter 58 km W of Agana, depth 117 km, 20:17 Local (1987-12-18 10:17 UTC). Shaking felt by ~101K people. Readings from every reporting agency, affected towns, aftershock sequence.

Philippine Sea (58 km W of Agana, Guam) — 13.315, 144.234

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